Grinding-mill



(No Model.)

B. DERBEO.

GRINDING MILL.

No. 403,421. Patented May 14, 1889.

IHUEmU r:

UNITED STATES PATENT OFFICE.

ETIENNE DERBEO, OF SAN FRANCISCO, CALIFORNIA.

GRlNDlNG-NllLL.

SPECIFICATION forming part of Letters Patent No. 403,421, dated May 14, 1889. Application filed November 28, 1888. Serial No. 292,138. (No model.)

To all whomit may concern.-

Be it known that I, ETIENNE DERBEO, a citizen of the United States, residing in the city and countyof San Francisco, and State of California, have invented certain new and useful Improvements in Grinding-Mills, of which the following is a specification.

My invention has for its object to produce a grinding pan or mill for disintegrating and working ores of the precious metals; and it consists in the construction and combination of parts according to the following description and the production of an improved pan or mill that is intended more especially-for operating on ores after they have been subjected to the roasting process.

In the accompanying drawings, Figure 1 represents my improved construction of pan or mill in vertical section. Fig. 2 is a top view of the rotating grinder. Fig. 3 is a detail View in perspective showing a portion of the stationary bed and the outer end portion of one of the grinding-plates.

A represents the bed or stationary surface on which the ore is distributed, and A is a surrounding trough of circular form surrounding the stationary bed and forming a receptacle to receive and carry off the material as it passes off at the periphery of the bed. A spout, A at one side of this trough serves to conduct the material from the pan into a suitable receptacle placed underneath. These parts are set on a suitable frame, WV, beneath which there is sufficient room provided for driving-gears and bearings to support and drive an upright shaft, B. This shaft passes through the stationary bed and has sufficient projection above it to take the hub of a circular grinding-frame, which, being fixed 011 the shaft, is driven rapidly by the rotation imparted through a belt-pulley, G and the gears D D The top face of the stationary bed slopes regularly from the center out to the periphery all around, and directly over the center a feed hopper or funnel, E, is placed. Suitable conductors for ore and water are arranged to deliver into the top of this hopper,

and the bottom has an outlet-aperture to discharge as nearly as practicable over the center of the bed.

The grinding-frame is composed of the center hub, G, that is fixed on the end of the shaft, an outer concentric rim, G", and a number of fiat arms or plates, H H, set edge- Wise, with their faces in planes making an acute angle with the stationary surface A, and their ends fixed in slots g in the central hub and surrounding ring. The edges of these plates that set against the bed are beveled, as shown in Fig. 3, and these constitute so many grindingsurfaces, between which and the stationary surface beneath the material is reduced. The arms or plates are also set out of a radial position, and in such angular or diagonal position as will throw the end of each arm next the hub somewhat ahead of the outer end, by which means the arms are made to act as scrapers to carry the material from the center outward to the periphery of the bed, and thus produce regular discharge from the rim into the surrounding trough.

The arms H are made detachable for convenience of packing and transporting, as well as for repairs, and are fixed in the inclined slots 9 of the hub and outer ring by wedges, bolts, or other suitable fastenings.

For the purpose of adjusting the working distance between the arms and the stationary bed, I set the upright shaft in a verticallyadjustable step -bearing, K, which, being formed of a screw-threaded block in athreaded socket, can be set up or down to raise or lower the grinders. Other construction of step-bearing to answer the same purpose can be as well used.

Having thus fully described my invention, What I claim, and desire to secure by Letters Patent, is-

1. The herein-described grinding-mill, consisting of the stationary bed having a sloping surface, the surrounding trough, the upright shaft having the grinding-frame mounted on it, the grinding-frame composed of radial arms or plates set at an angle to present acutelybeveled edges to the surface of the bed, and mechanism for rotating said frame, substantially as described. 7

2. In a grinding-mill for ores, the combination, with the sloping surface A, of the shaft, hub G, arms H, having beveled grinding-edges and being set in angular position, and the ring G", supported by the arms A, as set forth.

In testimony that I claim the foregoing I have hereunto set my hand and seal.

ETIENNE DERBEO. [L. s.]

WVitnesses:

EDWARD E. OSBORN,

GHAs. E. KELLY. 

